About Fast JSON to TypeScript
The Tool
Fast JSON to TypeScript is a premium, zero-overhead developer micro-tool designed for one purpose: converting raw JSON payloads into clean, accurate TypeScript interfaces in milliseconds. No servers, no tracking, no friction — just instant results directly in your browser.
Why We Built It
Every developer who works with REST APIs, webhooks, or third-party SDKs knows the pain of manually writing TypeScript interfaces from JSON responses. We built this tool to eliminate that friction entirely. Paste your JSON, get your TypeScript — it's that simple. The tool handles nested objects, arrays, nullable fields, snake_case conversion, and optional fields automatically.
100% Private by Design
Your data never leaves your browser. The entire conversion engine runs client-side using lightweight, dependency-minimised JavaScript. We've chosen a deliberately minimal dependency footprint — CodeJar (2KB) for the editor and PrismJS for syntax highlighting — so the page loads instantly and the tool is available even on slow connections.
Open & Free
The tool is free to use for individuals and teams, forever. It's designed to be part of a developer's daily workflow alongside their IDE, terminal, and documentation browser.
Contact & Feedback
Have a feature request or found a bug? We'd love to hear from you. Reach us at [email protected]